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Most likely speed controller. If mech the arm gets stuck. This also happens while in throttle. If electric you may need to reset it. Usually you will hear a faint beeping coming from it when holding down the throttle. If this doesn't fix . Buy new speed controller def electric. Don't waste your money, your car will be slot quicker w electric and way responsive and you'll stop losing it in the woods.

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13y ago

What else can I help you with?